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No. 626,327. Patented June 6, I899. W. KIRKALDY;

REVOLVING OYLINDRIOAL BULKHEAD DOOR.

(Application filed. Apr. 16, 1896.)

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REVOLVING CYLINDRIGAL BULKHEAD DOOR.

implication filed Apr. 18, 1896.)

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(No Model.)

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N'rnn STATES ATENT FFICE.

REVOLVING CYLINDRICAL BULKHEAD-DOOR SPECIFICATION forming part orLetters Patent No. 626,327, dated June 6, 1899. Application filedApril16,1896. Serial No. 5873 823. (No model.)

To all 1011,0772, it may concern:

Be it known that 1, WILLIAM KIRKALDY, a British subject, residing at 16Derby street, in the city and county of Glasgow, Scotland, have inventeda new and useful Revolving Cylindrical Door, (for which I have receivedLetters Patent in Great Britain, No. 18,923, dated October 9, 1895,) ofwhich the following is a specification.

My invention has for its aim and object the saving of life and propertyon land and at sea by providing a hollow cylindrical door which revolveswithin a suitable casing fixed to or forming part of an air-tight,water-tight, or fireproof bulkhead or partition dividing air and watertight compartments or fireproof rooms and the like. By combining thisrevolving cylindrical door and easing as hereinafter described a doubledoor and air-lock is formed, which effectually prevents the ingress offire, water, or air under pressure through air-tight, water-tight, orfireproof bulkheads or partitions in ships, caissons, tunnels,structures, and the like, yet on being revolved allows free thoroughfarebetween compartments or rooms so divided, with the certainty that at alltimes and under all conditions one of the doors must be absolutely'closed before the other door is open, thus guaranteeing that thebulkhead or partition is intact and thoroughly reliable in the event ofa sudden disaster. I attain this object by the combination hereindescribed, and illustrated in the accompanying drawings, in which-Figure 1 is a vertical section of the casing and revolving cylindricaldoor; Fig. 2, a horizontal section of the casing and revolvingcylindrical door; Fig. 3, a top View of easing.

Similar letters refer to similar parts throughout the several views.

The casing A, as shown on Figs. 1 and 2, is a hollow cylinder with aplain or corrugated surface and furnished with two or more doorways G Oin its circumference, close bottom and bolted on cover F, and externalflanges for fixing to bulkheads or partitions.

W'it-hin casing A, revolving on an overhead axial pin E or in othersuitable manner, is the revolving cylindrical door 13, which is a hollowcylinder with a plain or corrugated surface and having essentially adoorway D in its circumference, an open end, and handles I 1 inside andhand-recesses ll outside Then doorways O and D in casing A andcylindrical door B are in line, as shown on Figs. 1 and 2, free passagethrough bulkhead or partition is gained by entering and standing insideof easing A and revolving the cylindrical door 13 by means of thehandles H, when the ingress-door C is absolutely closed before thedoorway D comes in line with doorway O to allow egress from casing A. Topass through bulkhead or partition when the door 0 is closed, as shownin Fig. 2, insert hands into hand-recesses II and revolve cylindricaldoor B until the doorway D comes in line with doorway G. Then enter andstand inside of casing A and revolve the cylindrical door B by means ofhandles H, when the ingress-door O is absolutely closed before thedoorway D comes in line with doorway O to allow egress from casing A.Moreover, it is essential that the cylindrical door should be capable ofrevolving instantaneously when operated hurriedly by panic-stricken menpassing through the bulkhead, and it is evident that the meanshereinbefore described and illustrated constitute the simplest for thepurpose of revolving said door; but I do not therefore limit myself tothe sole use of said means, nor to the general construction of door andeasing, as it is obvious that the cylindrical door can be revolved byother known means of a mechanical nature and the general construction ofsaid door and easing varied without departing from the spirit of myinvention.

Packing may be inserted in grooves within the casing along edges ofdoorways; but the use of said packing is not, for obvious reasons, to bepreferred.

Having fully described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-- A bulkhead door orpassage-way, consisting of a cylindrical casing attached to the bulkheador partition and provided with doorways in opposite sides of itscircumference, a hollow cylindrical door having a doorway in itscircumference revolubly mounted in said casing and provided with handlesH on the inside and recesses H in the outside or with other suitablemeans by which said door may be revolved, substantially as described.

W'ILLIAM KIRKALDY.

Witnesses:

ROBERT KIRKALDY, MARGARET KIRKALDY.

